When life gives you tangerines middle aged Gwan-sik casting

Does anyone else feel like the casting for middle aged gwan sik is soo off? I mean I love bogum and the other actor is fine but I just don't think that they feel like the same person AT ALL. Middle aged ae sun is perfect and the actors actually feel like the same person (I lovee middle aged ae sun she's perfect haha) but in the sudden time jump to 1988 gwan sik is just different. I mean obviously but the personality isn't the quiet and patient gwan sik and it doesn't help that the actors look way too different. I think the directors should've corrected this while filming. I was thinking how Choi won young would've been perfect - especially his role from family by choice. Bogus and him look more similar too. They kept choi Dae hoon as the annoying guy so I wish they'd tried makeup to make IU and bogum look older (however I get this is VERY unrealistic since it's too much effort and wouldn't be possible for IU as she plays the daughter and I like the acting of older ae sun)

Overall though I LOVE THE KDRAMA SO MUCH I CANT everyone's character is so realistic and I never end up understanding the hype for the rude rich ml but he's my favourite since he's actually realistic as a person and is so sweet. Bogum's acting is top tier and everyone else did a great job